To work around this problem, use italic formatting and center the text
instead of using the Address style. When you save the document using the
HTML converter, Word will apply the italic <I>...</I>) tags and the
center attribute to the paragraph tag surrounding the address text.

Save your document as HTML.

Select the text you want to format.

On the Format menu, click Style.

In the Styles list, click Normal, and then click Apply.

With the text still selected, click Font on the Format menu.

Under Effects, click to select the Italic check box. Click OK.

To center the text, click the Center Align button on the Formatting
Toolbar.